C8051T322-GQR Silicon Labs, C8051T322-GQR Datasheet - Page 73

• Manufacturer Part Number: C8051T322-GQR
• Description: 8-bit Microcontrollers - MCU USB-OTP-16K-LQFP32
• Manufacturer: Silicon Labs

Specifications of C8051T322-GQR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

SFR Definition 12.6. PSW: Program Status Word
SFR Address = 0xD0; Bit-Addressable
Name
Reset
Bit
4:3
Type
7
6
5
2
1
0
Bit
PARITY
RS[1:0]
Name
CY
AC
OV
F0
F1
R/W
CY
7
0
Carry Flag.
This bit is set when the last arithmetic operation resulted in a carry (addition) or a bor-
row (subtraction). It is cleared to logic 0 by all other arithmetic operations.
Auxiliary Carry Flag.
This bit is set when the last arithmetic operation resulted in a carry into (addition) or a
borrow from (subtraction) the high order nibble. It is cleared to logic 0 by all other arith-
metic operations.
User Flag 0.
This is a bit-addressable, general purpose flag for use under software control.
Register Bank Select.
These bits select which register bank is used during register accesses.
00: Bank 0, Addresses 0x00-0x07
01: Bank 1, Addresses 0x08-0x0F
10: Bank 2, Addresses 0x10-0x17
11: Bank 3, Addresses 0x18-0x1F
Overflow Flag.
This bit is set to 1 under the following circumstances:
The OV bit is cleared to 0 by the ADD, ADDC, SUBB, MUL, and DIV instructions in all
other cases.
User Flag 1.
This is a bit-addressable, general purpose flag for use under software control.
Parity Flag.
This bit is set to logic 1 if the sum of the eight bits in the accumulator is odd and cleared
if the sum is even.



An ADD, ADDC, or SUBB instruction causes a sign-change overflow.
A MUL instruction results in an overflow (result is greater than 255).
A DIV instruction causes a divide-by-zero condition.
R/W
AC
6
0
R/W
F0
5
0
C8051T620/621/320/321/322/323
Rev. 1.1
4
0
RS[1:0]
R/W
Function
3
0
R/W
OV
2
0
R/W
F1
1
0
PARITY
R
0
0
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